 <!DOCTYPE html>
<style>
   body { zoom: 200%; }
</style>
<svg id="svg" width="500" height="500" viewBox='0 0 1000 1000'>
    <rect width='calc(50px + 50px)' height='100' fill='green'/>
    <rect x='110' width='calc(50 + 50)' height='100' fill='green'/>
</svg> 
